I'm looking for a Shot Timer. What do you guys recommend? I was looking at the PACT Club 3. Any Pro's or Con's with it?

Requirements..... need to start with what you want the timer for.
That will help with timer recommendations.

Want a very simple timer;
-  almost no features beyond timing. (only a countdown timer for walkthrough timing)
-  9V battery power, so unlike a rechargeable, re-powering is fast and easy. [good if you are timing a hundred or more shooters each day, every day.
-  4 buttons, makes it hard for anyone to get it wrong.
-  Simple display, hard to misread.

http://www.ruready.com/shotimer07.htm

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Have had the Competition Electronics Pocket Pro II for about 18mo now.  I’m pleased with it.

The CED7000 is another one I see most frequently at matches.

Pocket pro II

will be using it for running shooting drills so need splits and total, and eventually uspsa style shoots. I've been using a shot timer app, but it's not that great, counts reloads and slide running home as a shot.

Most consumer smartphones, if not all of them these days use very sensitive silicon microphones with built in amplifier, tailored to work with speech so working with loud shots of loudness over 130db overload them thus making it very challenging to use as shot detectors. This is why sometimes on phone app same shot can be detected 10times unless you set shot dead time
to half second or so, or you can clap your hands and fire 9mm and microphone wont see a difference. Its very hard to implement shot detection on smartphone with reliably, its not impossible, but it tricky.

Pocket pro II is my recommendation too. We use them for idpa, USPSA and 3 gun. Good volume control, sensitivity to pick up shots and consistent.

I don’t have any personal experience with it but there are a lot of reviews about the pact timer having inconsistent times when run side by side with others. Look it up on YouTube to see.

If it's just for you, and you intend to hold, and then shoot.
Consider this as an option. : https://www.doublealpha.biz/shotmaxx-2 they get pretty good reviews.
Good timer with useful features like Accelerometer mode

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Ive had a Pocket Pro for several years, no issues.